Your additional data are never sent to Google servers. All the map is built in JS, so once you have loaded Gmap scripts, there is no need to sent data.
You can check that in your browser developer console : no additional AJAX request are made to Google, once the first one for displaying map is finished.
If you use geocoder or directions service (and maybe other services, but I have never use them), you have to send addresses or LatLng to Google via AJAX in order to make calculation.